I'm sorry, no matter what I try I can't get my app to block you without manually doing it. Maybe it's because I'm using an older f-droid version of the app from Github? Is your npub in the source code somewhere?
Discussion
I have no idea how Vitor did it but its been like this for a month or two at least. It think thats when all the replyguy spam happened
My phone sucks balls way too hard for me to try and link the post explaining it, but apparently Amethist is just blocking people who made the same post 5 times in quick succession.
Don't get me wrong, despite how skeptical I am in general, I definitely believe in these kinds of hypothetical weird targeted, passive-aggressive blocking. It's happened to me! Part of why I'm on Nostr actually...